UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No.          )

Filed by the Registrant	x
Filed by a Party other than the Registrant	¨

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¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Materials Pursuant to §240.14a-12

AMERICAN CENTURY ASSET ALLOCATION PORTFOLIOS, INC.

AMERICAN CENTURY CAPITAL PORTFOLIOS, INC.

AMERICAN CENTURY GROWTH FUNDS, INC.

AMERICAN CENTURY MUTUAL FUNDS, INC.

AMERICAN CENTURY STRATEGIC ASSET ALLOCATIONS, INC.

AMERICAN CENTURY VARIABLE PORTFOLIOS, INC.

AMERICAN CENTURY WORLD MUTUAL FUNDS, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant

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